JP7286554B2 - Device for damping torsional vibration - Google Patents

Description

The present invention relates to a device for damping torsional vibrations, in particular for transmission systems of motor vehicles.

In such applications, a device for damping torsional vibrations may be incorporated into the torsional damping system of a clutch that can selectively connect the internal combustion engine to the gearbox. This is to eliminate vibrations due to engine irregularities. Such a system is for example a dual mass flywheel.

Alternatively, in such applications, devices for damping torsional vibrations may be incorporated into friction plates of clutches, hydrodynamic torque converters, hybrid powertrains, or rigidly coupled to the crankshaft of a vehicle. associated with the flywheel.

Devices of this type for damping torsional vibrations conventionally utilize a support and one or more pendulum assemblies movable with respect to the support, the displacement of each pendulum assembly with respect to the support being is guided by two rolling members. Each rolling member interacts with a raceway plane defined by the support on the one hand and by the pendulum assembly on the other hand. Each pendulum assembly comprises, for example, two pendulum masses riveted together.

At low rotational speeds, devices such as them are so sensitive to gravity that they are not moved by centrifugal force. This, in turn, can cause unwanted displacement of each pendulum assembly and thus mechanical noise due to collisions between the pendulum assembly and the support.

To solve this problem, it is known, for example from DE 10 2012 221 103, to provide a spring between two circumferentially adjacent pendulum assemblies. That is so that each pendulum assembly thus connected will withstand the gravitational forces exerted in turn when the device is subjected to rotational motion. The insertion of these springs entails forming additional receptacles on each pendulum assembly and providing suitable fixing means on those pendulum assemblies, which is costly and complicated. It is. Also, the insertion of springs causes the generation of additional resonance frequencies.

The insertion of the spring may also require forming an open notch in the support of the device, thus reducing swing of the pendulum assembly. Moreover, it is necessary to precisely dimension each spring, and there is no guarantee that the properties of each spring will be maintained over time.

DE 102012221103 A1

SUMMARY OF THE INVENTION It is an object of the present invention to obviate all or part of the above drawbacks while reducing the effect of gravity on each pendulum assembly, especially at low rotational speeds.

The present invention
- at least one support capable of rotational displacement about an axis;
- at least one pendulum assembly comprising at least one pendulum mass and movable with respect to the support;
- at least one rolling member, each rolling member interacting with at least one first raceway surface defined by the support and at least one second raceway surface defined by the pendulum assembly; rolling members, and displacement of the pendulum assembly relative to the support is guided by at least one of the rolling members;
A device for damping torsional vibrations, comprising:
This is achieved by employing a device comprising at least one friction member carried by the pendulum assembly for producing hysteresis in all or part of the relative displacement of the pendulum assembly and the support. to achieve.

Collisions (particularly due to gravity) between the pendulum assembly and the support are thus prevented. As the support rotates, each pendulum assembly in turn assumes the highest position about the axis of rotation of the support, but the presence of the friction member thus limits downward displacement of that pendulum assembly in response to gravity. or slowed down.

For the purposes of this application:
- "axial" means "parallel to the axis of rotation of the support";
- "radial" means "along an axis lying in a plane perpendicular to and intersecting the axis of rotation of a support";
- "angular" or "circumferential" means "around the axis of rotation of the support";
- "orthogonal" means "perpendicular to the radial direction";

The invention also relates to the friction member considered alone.

The friction member can create hysteresis regardless of the relative positions of the support and the pendulum assembly.

The friction member may be arranged axially between the pendulum mass and the support. Thus, the fact that the friction member is axially between the pendulum mass assembly and the support means that the friction member also has an intervening function to prevent axial collisions between the pendulum assembly and the support. It means that you can.

According to a first variant, the friction member is axially greater than the axial spacing between the pendulum mass and the support. The axial dimension may be the axial distance between two axial extremities. The friction member is thus compressed between the pendulum mass and the support.

In particular, the friction member may comprise positioned axial projections to come into contact with the support. This axial projection may have a bubble (spherical) shape. This axial projection may be created by entrapping air within the friction member during manufacture of the member.

Alternatively, the axial projections may have any shape adapted to create hysteresis (eg, undulations, pins, etc.). Alternatively, the axial projection may be an insert member fixed on the friction member. Several axial projections may be arranged on the friction member.

Alternatively or in combination, the friction member may comprise at least one narrowed area for locally deflecting the friction member into contact with the support. Warping may be obtained by plastic deformation of the narrowed area. The friction member may be provided with cuts (advantageously two cuts). The cuts extend from the contour of the friction member, one closer to the other to define a narrowed area. The deflection may be at the circumferential ends of the friction member.

Alternatively or in combination, the friction member may comprise at least one positioned axial abutment area to be at least partially in contact with the rolling member. The hit area may have any shape adapted to create hysteresis (eg, undulations, creases, etc.). Several contact areas may be arranged on the friction member. The axial strike zone makes it possible to create hysteresis at all displacements of the rolling member or members.

The hit area may comprise a recess.

In particular, the contact areas of the friction member may exert axial stresses at least on lateral extents of the axial faces of the rolling members. Axial stress forces the rolling member against the opposing pendulum mass. Axial stress can be applied in lateral areas whose surface and position can vary depending on the position of the rolling member relative to the support and pendulum mass. The magnitude of the axial stress can be comprised between 1 and 5 N (Newtons).

Alternatively or in combination, the friction member may comprise at least one localized bent area for contacting the rolling member. The friction member may comprise at least one narrowed area for locally folding the friction member into contact with the rolling member. The folding area may be obtained by plastic deformation of the narrowing area. The friction member has a cut and a bending, plastic deformation or warp in the area between the cut and the contour of the friction member, or two parallel cuts and these two parallel cuts (preferably two parallel cuts). It may also be provided with a fold in the region between two circumferentially offset sets of notches. The folds may be at the circumferential ends of the friction member.

The folded area of the friction member may apply axial stress only on the radially inner extent of the axial face of the rolling member. Axial stress forces the rolling member against the opposing pendulum mass. Axial stresses are generated as close as possible to the areas of interaction between the raceway surfaces defined by the support and the rolling members. The axial stress may be applied radially inward with respect to the rolling member in an area extending over 20 percent (preferably 10 percent) of the diameter of the rolling member. The magnitude of the axial stress can be comprised between 1 and 5 N (Newtons).

According to a second variant, a progressive member is arranged axially between the friction member and the pendulum mass so as to force the friction member into contact with the support. In this variant, the friction member is compressed between the progressive member and the support rather than between the pendulum mass and the support. Contrary to the first variant, it is not the shape of the friction member that allows the hysteresis to occur, but an additional component arranged between the pendulum mass and the friction member. I do.

The progressive element limits the downward displacement of the pendulum assembly in response to gravity, with intervening members used only to prevent axial collisions between the pendulum assembly and the support. It is possible to adapt the friction member to slow down or slow down. The progressive member may be a metal sheet with folds or undulations (eg, two folds) to provide elasticity to the progressive member. The folds may extend generally radially between the inner and outer peripheral edges of the progressive member. These folds may define several surfaces facing in different directions. In other cases, the progressive member may be generally or locally corrugated.

The progressive member may match the contour of the friction member so that the progressive member and the friction member have the same overall shape.

Alternatively, the progressive member may comprise a spring or elastic component.

The progressive member may be held on the support with the friction member's anchoring portion resting on the pendulum mass. The mutual axial action of the supports on the friction member makes it possible to keep the progressive member between the pendulum mass and the friction member. The locking sites prevent release of the progressive member during the assembly phase and during high acceleration of the support.

In addition to its fixing portion, the friction member may comprise an intermediate portion which is arranged axially between the pendulum mass and the support.

According to a first variant, the interposed portion can be a flat surface from which the axial projection, the cambered portion, the striking area or the bending area extends. According to a second variant, the intervening site can be forced into contact with the support. The intervening portion can be locally offset from the pendulum mass by the progressive member to contact the support.

The anchoring site may extend through the progressive member. The fixation portion may comprise at least two fixation tabs and a stiffener connecting the two tabs. The securing portion may extend between the end that emerges from the intervening portion and the free end, with each securing tab extending between these ends. The reinforcement may connect the tabs at the ends of the tabs that emerge from the intervening site. The stiffener may then allow the friction member, and eventually the progressive member, to be properly seated on the pendulum mass, in particular to center the friction member on the pendulum mass.

Each locking tab may include a hook for snap locking the friction member onto the pendulum mass.

The friction member may have two types of locking portions, each of which may have two tabs pointing in the same direction. The orientation of each type is different from each other, but advantageously they are perpendicular to each other. It allows an excellent immobilization of the friction member on the pendulum mass and makes it easy to make the respective fixing points. Each locking site may be positioned such that the pendulum mass can be displaced from the friction member by 0.5 to 5 times the thickness of the friction member.

The progressive member may comprise an aperture surrounding each fixation site. Alternatively, the progressive member may comprise at least one coupling portion cooperating with the friction member and the pendulum mass to avoid any relative movement therebetween. In particular, the progressive member may cooperate with a locking portion of the friction member (eg, by coupling two concentric cylindrical projections from each member). Independently or additionally, the progressive member may comprise at least one edge cooperating with the inner or outer perimeter of the pendulum mass for radially maintaining the progressive member. .

Alternatively, the fixing portion of the friction member may be an opening. Each friction member is rigidly connected to one of the pendulum masses by riveting or bolting through the openings. The friction member may be made of plastic. These materials are particularly well adapted to be non-abrasive to the support metal. This is because these materials maintain low wear properties and their coefficient of friction with metal is sufficient to prevent collisions with the support of the pendulum assembly.

Alternatively, the friction member may be made of metal. The metal sheet may have folds or undulations to provide elasticity to the friction member.

The friction member may be elastic. The elasticity of the friction member can absorb impact.

According to a first embodiment of the invention, the device comprises only one support and the pendulum assembly comprises first and second pendulum masses axially spaced from each other. a first pendulum mass axially arranged on a first side of the support and a second pendulum mass axially arranged on a second side of the support;
at least one member couples the first and second pendulum masses to pair the masses;
The device also comprises two friction members, each axially arranged between one of the pendulum masses and the support.

Alternatively, the device may comprise at least one friction member, which is arranged axially only between one pendulum mass and the support.

The device may comprise two separate circumferentially offset friction members, each associated with a respective one of the rolling members.

A coupling member of this kind is, for example, pressed via each of its axial ends into an opening formed in one of the pendulum masses. Alternatively, the connecting member may be welded onto each pendulum mass via its axial ends. The connecting member may be bolted or riveted onto each pendulum mass.

According to a first variant of the first embodiment, the coupling member may define a first raceway surface for guiding the movement of the pendulum assembly relative to the support.

According to a first variant of this first embodiment, the pendulum assembly is two coupling members pairing the first and second pendulum masses, each coupling member being a pendulum assembly to the support. A coupling member may be provided defining a first raceway surface each interacting with one of the two rolling members guiding the displacement of the volume. Each rolling member now interacts with a single raceway surface on the pendulum assembly side. A portion of the periphery of the coupling member, eg, a portion of the radially outer surface of the coupling member, defines this raceway surface, eg integral with the pendulum assembly. In this case, the rolling members can also cooperate with another first raceway surface defined by the support, but in particular of the window holes provided in the support in which the coupling member is arranged. defined by a portion of the perimeter;

According to a first variant of this first embodiment, each rolling member thus has a raceway surface defined by the support and a raceway surface defined by the pendulum assembly as described above. can be stressed exclusively in compression. Those raceway surfaces that interact with a given rolling member may, at least partially, radially face each other. That is, there is a plane perpendicular to the axis of rotation and spanned by both of those raceway surfaces.

According to a first variant of this first embodiment, for all or part of the relative position between the pendulum assembly and the support, each friction member axially carries a pendulum mass carrying them. It may be arranged between the body and the rolling member. This makes it possible to axially guide the movement of the rolling members and to prevent undesired axial collisions (particularly if those elements are made of metal).

According to a second variant of the first embodiment, if there is still one support and the pendulum assembly comprises two pendulum masses paired with each other, then each rolling member has a pendulum It can interact with two different orbital planes defined by the assembly. One of these orbital planes is defined by the first pendulum mass and the other of these orbital planes is defined by the second pendulum mass.

According to this second variant, each connecting member is for example a rivet. The rivet can be received in a hollow portion of the support that does not already receive the rolling member. As noted above, a portion of the perimeter of the aperture in the support may define the track surface of the support.

According to the second modification of the first embodiment, each rolling member is sequentially arranged in the axial direction.
- a portion located in the hollow of the first pendulum mass and interacting with the orbital plane constituted by a part of the circumference of the hollow;
- a portion located in a window of the support and interacting with the raceway surface constituted by a portion of the periphery of the window;
- a portion located in the hollow of the second pendulum mass and interacting with the orbital plane constituted by a part of the circumference of the hollow;
can be provided.

The device may differ from a device with a single support. According to a second embodiment of the invention, the device comprises two separate axially offset supports, the pendulum assembly being axially arranged between the two supports. Each support defines a first raceway surface for interacting with the same rolling member.

In this second embodiment, the device may comprise two friction members, each axially arranged between the pendulum mass and one support.

Alternatively, the device may comprise at least one friction member, which is arranged axially only between the pendulum mass and one of the supports.

The device may comprise two separate circumferentially offset friction members, each associated with a respective one of the rolling members.

The pendulum assembly may comprise at least one pendulum mass, in particular a single pendulum mass, or several pendulum masses, preferably rigidly coupled together, all of which are axially It is preferably arranged between two supports. One or more pendulum masses are thus axially sandwiched between the two supports. The two supports are rigidly connected together via a connection, for example a riveted connection located radially inwardly with respect to the pendulum assembly.

The shape of each raceway surface is such that each pendulum assembly
- in movement about a notional axis parallel to the axis of rotation of the support, and
- in the direction of rotation about the center of gravity of the pendulum assembly and
such a motion is also called a "compound motion".

Alternatively, the shape of the track surface described above may be such that each pendulum assembly is displaced relative to the support only in movement about a notional axis parallel to the axis of rotation of the support. good.

The present invention also provides
- a primary flywheel for fixing to the crankshaft;
- a secondary flywheel connected to the primary flywheel by a plurality of resilient return members;
- a device for damping torsional vibrations as defined above, the support of which is mounted in particular on the secondary flywheel;
Also provided is a dual mass flywheel with

A device for damping torsional vibrations may alternatively be part of a component for a motor vehicle transmission system that is not a dual mass flywheel. This component forms part of a hydrodynamic torque converter, a friction clutch plate, a dry or wet dual clutch, a wet single clutch, a flywheel integral with the crankshaft, or a hybrid drivetrain. can be a component that

In all of the above, the device for damping torsional vibrations is based on the excitation conditions of the internal combustion engine of the vehicle in which it is installed, which engine in particular has two, three or four cylinders. It is constructed so that it can be removed by displacement of the solid.

In all the above, the device may for example comprise several pendulum assemblies between 2 and 8, in particular 3 or 6 pendulum assemblies. All these pendulum assemblies may continue in the circumferential direction. Thus, the device for damping torsional vibrations may comprise a plurality of planes perpendicular to the axis of rotation, in each of which planes all the pendulum assemblies are arranged.

In all of the above, each support may be embodied as a single piece (eg made entirely of metal).

In all of the above, the device:
- at least one first pendulum assembly, which makes it possible to eliminate the first order of torsional vibrations (primary torsional vibrations);
- at least one second pendulum assembly, which makes it possible to eliminate the second order of torsional vibrations (secondary torsional vibrations), which is different from the first order of the torsional vibrations;
may be provided.

When the device for damping torsional vibrations is part of a component, the support for the device for damping torsional vibrations comprises:
- the flange of the component;
- the guide washer of the component,
- the phase washer of the component, or
- a support separate from said web, said guide washer and said phase washer;
may be one of

The present invention also provides
- an internal combustion engine for vehicle propulsion, in particular having 2, 3 or 4 cylinders,
- components of the transmission system as defined above;
A vehicle drivetrain is also provided.

A better understanding of the invention will be obtained from reading the following description of non-limiting exemplary embodiments of the invention and from considering the accompanying drawings.

FIG. 3 shows a dual-mass flywheel with a device for damping torsional vibrations; 1 is a diagram partially showing an example of a device according to a first example of a first embodiment; FIG. 1 is a diagram partially showing an example of a device according to a first example of a first embodiment; FIG. FIG. 11 partially shows an example of an apparatus according to a second embodiment; FIG. 5 is a diagram showing an example of a friction member according to a first modified example; FIG. 5 is a diagram showing an example of a friction member according to a first modified example; FIG. 5 is a diagram showing another example of the friction member according to the first modified example; Fig. 2 shows a device with friction members according to a second variant; Fig. 2 shows a device with friction members according to a second variant; FIG. 5 is a diagram showing another example of the friction member according to the first modified example; FIG. 5 is a diagram showing another example of the friction member according to the first modified example; FIG. 12 partially shows an example of a device according to a first embodiment with friction members according to FIGS. 10 and 11; FIG. 15 partially shows an example of a device according to the first embodiment with a friction member according to FIG. 14; FIG. 5 is a diagram showing another example of the friction member according to the first modified example; FIG. 5 is a diagram showing another example of the friction member according to the first modified example; FIG. 5 is a diagram showing another example of the friction member according to the first modified example;

FIG. 1 shows a dual-mass flywheel 1 that is part of a vehicle's drivetrain. This drivetrain also has an internal combustion engine with 2, 3 or 4 cylinders.

A dual mass flywheel 1 comprises a primary flywheel 3 and a secondary flywheel 6 connected to the primary flywheel. This primary flywheel 3 has a flange 5 and a ring gear 7 . This primary flywheel may be fixed relative to the crankshaft of the internal combustion engine.

The secondary flywheel 6 comprises a flange 8 interacting with a resilient return member 9 . Each elastic return member 9 is a spring in the embodiment described. Those springs 9 allow rotational displacement of the secondary flywheel 6 about the axis X with respect to the primary flywheel 3 .

FIG. 1 shows that the flange 8 is riveted onto the hub 10 of the secondary flywheel 6 . Hub 10 has splines that allow it to be fitted onto a shaft.

The dual-mass flywheel 1 comprises a pendulum-type device 22 for damping torsional vibrations.

This device 22 comprises a support 24 which is riveted onto a connecting plate 29 by rivets 32 in the example described. The connecting plate 29 is riveted to the hub 10 and the flange 8 via rivets 30 .

The device further comprises a pendulum assembly 25 . Three different examples of devices 22 for damping torsional vibrations will now be described with reference to FIGS. These three devices can be incorporated into the dual mass flywheel of FIG.

In FIG. 2, device 22 is in a neutral position. That is, the system does not eliminate torsional vibrations due to internal combustion engine irregularities transmitted by the drive train.

In the example considered, six pendulum assemblies 25 are provided, evenly distributed around the axis X;

In the example considered, the support 24 is generally in the shape of a ring, the ring having two opposite sides 26, here flat surfaces.

As shown in FIG. 2, in the example considered, each pendulum assembly 25:
- two pendulum masses 27, each extending axially opposite one side 26 of the support 24;
- two coupling members 40 rigidly connecting the two pendulum masses 27;
It has

In the example considered, the connecting members 40 (also called "spacers") of the same pendulum assembly 25 are angularly offset. Each assembly 25 extends angularly between two circumferential ends corresponding respectively to the circumferential ends of the pendulum masses 27 in that assembly.

In the example of FIG. 2, each connecting member 40 is press fit into an opening formed in one of the pendulum masses 27 of the pendulum assembly 25 . The reason is that the two pendulum masses 27 are rigidly coupled to each other.

In yet another alternative, each end of the connecting member 40 is rigidly connected to one of the pendulum masses 27 by welding, riveting or bolting.

The device 22 for damping torsional vibrations further comprises rolling members that guide the displacement of the pendulum assembly relative to the support 24 . The rolling members are rollers here.

In the illustrated example, the movement of each pendulum assembly 25 relative to the support 24 is guided by two rolling members. This exercise is, for example, a compound exercise.

Each rolling member is received in a window formed in support 24 . Each aperture has a continuous perimeter with a portion of the perimeter defining a first raceway plane integral with support 24 . One of the rolling members received in the window rolls on the first raceway surface.

In the example of FIG. 2 each window also receives a connecting member 40 of the pendulum assembly 25 . Each connecting member 40 defines a second track plane integral with the pendulum assembly 25 to which the connecting member 40 belongs. One of the rolling members rolls on the second raceway surface to guide the displacement of the pendulum assembly 25 relative to the support 24 . The second raceway surface is defined, for example, by a portion of the radial outer surface of the connecting member 40 .

The device 22 of FIG. 2 further includes a hit damping member 35 for damping the shock associated with the pendulum assembly 25 striking the support 24 . In the example of FIG. 2 each connecting member 40 is associated with such a hit damping member 35 . The hit damping member 35 is configured, for example, to be compressed between the edge of the window opening that receives the rolling member and the radially inner edge of the coupling member 40 .

The hit damping member comprises an axial projection received within a bore located inside the pendulum mass. Each protrusion allows a hit damping member to be attached to the pendulum mass 27 .

FIG. 3 shows another variant of the device 22 . This device 22 also comprises a single support 24 and several pendulum assemblies 25, each pendulum assembly 25 comprising two pendulum masses 27 also rigidly coupled together. .

Contrary to what has been described with reference to FIG. 2, each window hole 45 arranged in support 24 does not accommodate a rolling member or a connecting member 40 . Each connecting member 40 (in this case a rivet) is received in a hollow that does not contain any rolling members.

In the example of FIG. 3, each rolling member 11 is sequentially axially
a portion located in the hollow of the first pendulum mass 27 and interacting with the second raceway surface constituted by a part of the circumference of the hollow;
- a portion located in the window 45 of the support 24 and interacting with the first raceway surface constituted by a portion of the periphery of the window;
- a portion located in the hollow of the second pendulum mass 27 and interacting with the second raceway surface constituted by a part of the circumference of the hollow;
It has

FIG. 4 shows the device 22 of another embodiment. Contrary to what has been described with reference to FIGS. 2 and 3, the device 22 comprises two separate axially offset 24 supports, each pendulum assembly 25 axially displaced between two supports 24 . is placed between. Each support defines a first raceway surface 13 for interacting with the same rolling member.

In this example, each pendulum assembly 25 may comprise only one pendulum mass 27 arranged axially between two supports 24 . The pendulum mass(es) is then axially sandwiched between the two supports. The two supports 24 are rigidly connected, for example via a connection such as a riveted joint located radially inwardly with respect to the pendulum assembly 25 .

In the example of FIG. 4, each rolling member 11 is sequentially axially
- a portion located in the window 45 of the first support 24 and interacting with the first raceway surface 12 constituted by part of the periphery of the window;
a portion located in the hollow of the pendulum mass 27 and interacting with the second raceway surface 13 constituted by a part of the circumference of the hollow;
- a portion located in the window 45 of the second support 24 and interacting with the first raceway surface constituted by a portion of the periphery of the window;
It has

In the example of FIG. 12, each rolling member 11 is axially sequentially
- a portion (this portion presents a first surface 120 interacting with the friction member 50 in relation to the first pendulum mass 27 and a second opposite surface 121;
a portion or pin 111 extending from the second plane, located in the window of the second pendulum mass 27 and interacting with the first raceway plane constituted by part of the periphery of the window;
It has

Figures 5 to 15b show various examples of five different variants of the friction member 50 described in Figures 1 to 4 that can be carried by each pendulum mass 27. In particular, there is at least one friction member 50 between the pendulum mass 27 or one pendulum mass 27 and one support 24 or supports 24, respectively. For example, as shown in FIGS. 8 and 9, there is a friction member 50 between each pendulum mass 27 and the (respective) support 24 .

One pendulum mass 27 of pendulum assembly 25 may carry at least one friction member 50 on the side associated with support 24 . In the embodiment of FIG. 4, each pendulum mass 27 may carry two friction members 50 on opposite sides. 12, only one pendulum mass 27 in each pendulum assembly 25 may carry two friction members 50 on the side associated with support 24. In FIG. 13, only one pendulum mass 27 in each pendulum assembly 25 may carry one friction member 50 on the side associated with support 24. In FIG.

In all instances the friction member 50 provides hysteresis at all relative displacements between the pendulum assembly 25 and the support 24 regardless of the relative positions of the support 24 and the pendulum assembly 25 .

Collisions (especially due to gravity) between the pendulum assembly 25 and the support 24 are thus prevented. As the support 24 rotates, each pendulum assembly 25 in turn assumes the highest position about the support's axis of rotation, but the presence of the friction member 50 thus permits downward movement of that pendulum assembly in response to gravity. Displacement is limited or slowed down.

Friction member 50 is specifically made of a dampening material such as plastic. Alternatively, friction member 50 may be made of a resilient metal.

In all cases the friction member 50 is arranged axially between one pendulum mass 27 and the support 24 . Thus, although the friction member 50 is axially between the pendulum mass/assembly and the support, the friction member has an intervening function to prevent axial collision between the pendulum assembly and the support. This means that it can also have

In all the examples described, each friction member 50 has at least one fixing portion 52 on the pendulum mass 27 and an intervening portion 53 axially arranged between the pendulum mass 27 and the support 24 . and For example, in FIGS. 5-9 each friction member 50 has four locking portions 52, in FIGS. 10-12 each friction member 50 has two locking portions 52, and in FIGS. 15a and 15b, each friction member 50 has eight locking portions 52, and each friction member 50 has one locking portion 52 in FIGS. 15a and 15b.

The intervening portion 53 extends between two circumferential ends 54 on the radially outer side of the coupling member. The intervening portion also has a radially inner end 55 circumferentially between the ends 54 . Circumferentially between the ends 54, the intervening portion also has an upper radial end 55b.

For example, each fixation portion 52 may include two fixation tabs 58 and a stiffener 59 connecting the two tabs. The securing portion 52 extends between the end emerging from the intervening portion 53 and the free end with each securing tab 58 extending between these ends. A reinforcement 59 connects the tabs 58 at the ends of the tabs 58 that emerge from the intervening portion 53 .

Each locking tab 58 includes a hook for snap locking the friction member 50 onto the pendulum mass 27 .

In the example illustrated partly in FIG. 5 and partly in FIG. 9, the friction member 50 has two types of locking portions, each one oriented in the same direction. It has two facing tabs 58 . The orientation of each model is perpendicular to each other. Each circumferential end 54 has one other type of fastening portion 52 while the radially inner end 55 has two first type fastening portions 52 .

Alternatively, each fixation site 52 may comprise an aperture. Each friction member 50 is rigidly connected to at least one of the pendulum masses 27 by a riveting 52a or bolting through the aperture.

In the example described in part in FIGS. 5 and 6 and in other parts in FIGS. 7, 10, 11, 14, 16a and 16b, the friction member 50 comprises the pendulum mass 25 and the support. 24 in the axial direction.

In the example illustrated in FIGS. 5 and 6, the friction member 50 is provided with axial projections 60 positioned to contact the support 24 . Interposed portion 53 is a planar surface from which axial projection 60 extends.

This axial projection 60 has a bubble (spherical) shape. This axial projection may be created by entrapping air within the hollow portion 61 of the friction member during manufacture.

In the illustrated example, this axial projection 60 is positioned radially outward of the radially inner end 55 between the circumferential ends 54 on the friction member. This axial projection is positioned to always contact the support regardless of the relative positions of the support 24 and the pendulum assembly 25 .

In the example illustrated in Figure 7, the friction member 50 comprises two narrowed areas 56 for locally deflecting the friction member to contact the support. The warp is obtained by plastic deformation of the narrowed area 56 . The camber is on each circumferential end portion 54 of the friction member. Friction member 50 includes cuts 57 (two cuts per narrowed area). The notches 57 extend from the contour of the friction member 50 and are converging one to the other to define a narrowed area. In this example, the cuts of each narrowed section converge at one of the fixation sites 52 . A notch 57 in each narrowed section is on each side of this fixation portion 52 .

In the example illustrated in FIGS. 10 and 11, friction member 50 may include at least one narrowed area 56 for locally folding said friction member 50 into contact with rolling member 11 . Alternatively or additionally, friction member 50 may include at least one notch 157 . At least one notch 157 may extend within the intervening portion 53 near the upper end 55b. Incisions 157 may be adapted to locally fold friction member 50 to contact rolling member 11 . Folding is obtained by plastic deformation of the narrowed area 56 and/or the area near the notch 157 . The fold is on the area of the upper end 55b of the friction member. A fold area 150 may be located between the notch 157 and the upper end 55 b , the fold area 150 being axially offset with respect to the intervening portion 53 of the friction member 50 to contact the rolling member 11 . It is

In the example illustrated in FIG. 14, the friction member 50 may comprise two narrowed areas 56 for locally folding the friction member 50 to contact the rolling member 11. In the example illustrated in FIG. Alternatively, or in addition, friction member 50 may include four parallel cuts 157 of two each. Preferably, two sets of two parallel cuts 157 are circumferentially offset. There may be a set of two parallel cuts 157 at each circumferential end portion 54 . Interposed portions 53 between two cuts 157 in a set of parallel cuts 157 may be folded to contact rolling member 11 . The fold area 150 is obtained by plastic deformation of the narrowed area 56 and/or the area between two incisions 157 in a set of parallel incisions 157 . The fold area 150 is at the inner end 55 of the friction member 50 . The fold section 150 may be axially offset relative to the intervening portion 53 of the friction member 50 to contact the rolling member 11 . Each fold section 150 of the friction member 50 can apply axial stress only to the radially inner extent of the first axial surface of the rolling member 11 associated with the friction member 50 . The axial stress presses the rolling member 11 against the pendulum mass 27 on the opposite side. Axial stresses are generated as close as possible to the areas of interaction between the raceway surfaces defined by the supports 24 and the rolling members 11 . Axial stress may be applied radially inward with respect to rolling member 11 in an area extending over 20 percent (preferably 10 percent) of the diameter of rolling member 11 . The magnitude of the axial stress can be comprised between 1 and 5 N (Newtons).

15a and 15b, the friction member 50 comprises a contact area 160 for at least partially contacting the rolling member 11. In the example illustrated in FIGS. Hitting area 160 may comprise a recess 161 . The hit area 160 can preferably be on one circumferential end portion 54 . The hit area 160 may be obtained by plastic deformation. The abutment area 160 may be axially offset relative to the intervening portion 53 of the friction member 50 to contact the rolling member 11 .

In particular, the abutment area 160 of the friction member 50 may apply axial stress on at least the lateral extent of the axial face of the rolling member. The lateral extent may be a portion of the first axial surface of rolling member 11 associated with friction member 50 . The axial stress presses the rolling member 11 against the pendulum mass 27 on the opposite side. Axial stress can be applied in lateral areas whose surface and position can vary depending on the position of rolling member 11 relative to support 24 and pendulum mass 27 . The magnitude of the axial stress can be comprised between 1 and 5 N (Newtons).

In the example illustrated in FIGS. 8 and 9, axially between one friction member 50 and each pendulum mass 27, for each pendulum assembly, the intervening portion 53 is forced into contact with the support 24. A progressive member 70 is arranged in the . Each fixation site 52 extends through progressive member 70 . Interposed portion 53 is locally offset from pendulum mass 27 by progressive member 70 to contact support 24 . Progressive member 70 may be a metal sheet and may include folds 72 to provide elasticity. The folds 72 extend generally radially between the inner and outer peripheral edges of the progressive member 70 . These folds define several surfaces oriented in different directions so as to impart elasticity to the progressive member.

Progressive member 70 matches the contour of friction member 50 .

The progressive member 70 is retained on the support 24 at friction member anchoring points 52 .

In the example illustrated in FIG. 8, friction member 50 is not snap-locked onto pendulum mass 27 . Each fixing part 52 is mounted without play on the pendulum mass 27 . Each fixing portion 52 is a cylindrical projection cooperating with a respective hole in pendulum mass 27 . Progressive member 70 includes cylindrical projections 75 , each surrounding a concentric projection of friction member 50 .

In the example illustrated in FIG. 9, progressive member 70 includes openings 78 surrounding each fixation site 52 as described with reference to FIGS. The progressive member 70 also has two outer edges 79 cooperating with the outer peripheral edge of the pendulum mass 27 and an inner edge cooperating with the outer peripheral edge of the pendulum mass 27 for radially maintaining the progressive member. a portion 80;

The invention is not limited to what has been described above.

In other non-illustrated examples, the device 22 for damping torsional vibrations can be incorporated into transmission system components that are not dual-mass flywheels. The component may be, for example, a hydrodynamic torque converter, a friction clutch plate, a dry or wet dual clutch, a wet single clutch, a flywheel integral with the crankshaft, or part of a hybrid drivetrain. It is the component that forms.

In a known manner, such a component is a torsional damper exhibiting at least one input element, at least one output element and a circumferentially acting elastic return member interposed between said input and output elements. can be provided. The terms "input" and "output" are defined in terms of the direction of torque transfer from the vehicle's internal combustion engine to the vehicle's wheels. and the support 24 of the device 22:
- the input element of the torsional damper,
- an output element or intermediate tuning element located between the two sets of springs of the damper, or
- an element separate from the above-mentioned elements, rotationally connected to one of the above-mentioned elements, thus for example a support specific to the device 22;
It can be configured by

Claims (19)

- at least one support (24) capable of rotational displacement about an axis (X);
- a first pendulum mass and a second pendulum mass, and a coupling member that couples the first pendulum mass and the second pendulum mass to pair the pendulum masses; , at least one pendulum assembly (25) movable with respect to said support (24);
- at least one rolling member, each rolling member (11) being driven by at least one first raceway surface (12) defined by said support (24) and said pendulum assembly (25); Interacting with at least one defined second raceway surface (13), displacement of said pendulum assembly (25) relative to said support (24) causes at least one of those rolling members (11) to a rolling member guided by one;
A device (22) for damping torsional vibrations, comprising:
at least one friction member (50) carried by said pendulum assembly for providing hysteresis in all or part of the relative displacement of said pendulum assembly and said support;
Said at least one friction member (50) comprises at least one fixing portion (52) and an intervening portion (53) axially arranged between said first pendulum mass and said support (24). ), said friction member (50) being fixed to said first pendulum mass at said at least one fixing portion (52), said intervening portion (53) being the radius of all said connecting members A device extending between two circumferential ends (54 ) of said friction member (50) in the direction outward. The apparatus of claim 1, wherein said friction member (50) provides hysteresis regardless of the relative positions of said support and said pendulum assembly. said friction member (50) and said first pendulum mass axially to force said friction member (50) into contact with at least one of said support (24) or said rolling member (11); The device of claim 1, further comprising a progressive member (70) positioned between the body (27). 4. A device according to claim 3, wherein said progressive member (70) is a metal sheet with folds (72) or undulations to impart resilience to said progressive member. Said progressive member (70) is mounted on at least one of said support or said rolling member (11), with said friction member fixing portion (52) fixed to said first pendulum mass. 5. Apparatus according to claim 3 or 4, held thereon. 6. The method according to any one of claims 1 to 5, wherein said friction member (50) is axially greater than the axial spacing between said first pendulum mass (27) and said support (24). Apparatus as described. The apparatus of claim 6, wherein said friction member (50) comprises a positioned axial projection (60) to contact said support (24). 8. Apparatus according to claim 6 or 7, wherein the friction member (50) comprises at least one narrowed area (56) for locally deflecting the friction member into contact with the support. 9. Claims 6 to 8, wherein said friction member (50) comprises at least one positioned axial abutment area (160) to be at least partially in contact with said rolling member (11) A device according to any one of the preceding claims. 10. The device of claim 9, wherein the abutment area (160) comprises a recess (161). 11. Apparatus according to claim 9 or 10, wherein said abutment area (160) of said friction member exerts an axial stress at least on the lateral extent of the axial surface (120) of said rolling member (11). . 9. According to any one of claims 6 to 8, wherein said friction member (50) comprises at least one local fold area (150) for contacting said rolling member (11). Device. 13. Claim 12, wherein said folding section (150) of said friction member (50) exerts an axial stress only on the radially inner extent of the axial surface (120) of said rolling member (11). Apparatus as described. 14. Apparatus according to any one of the preceding claims, wherein said friction member (50) is made of plastic or metal. 15. Apparatus according to any one of the preceding claims, wherein said friction member (50) is elastic. It comprises only one support (24), said first pendulum mass (27) being axially arranged on a first side (26) of said support (24) and said second a pendulum mass (27) of is arranged axially on the second side (26) of said support (24),
at least one coupling member (40) couples the first and second pendulum masses (27) to couple the first and second pendulum masses;
The device comprises two friction members (50), one friction member (50) axially between said first pendulum mass (27) and said support (24) and the other friction member (50). 16. Apparatus according to any one of the preceding claims, wherein a member (50) is arranged between said second pendulum mass (27) and said support (24). It comprises only one support (24), said first pendulum mass (27) being axially arranged on a first side (26) of said support (24) and said second a pendulum mass (27) of is arranged axially on the second side (26) of said support (24),
16. According to any one of claims 1 to 15, wherein said at least one friction member is arranged axially only between said first pendulum mass (27) and said support (24) Apparatus as described. 18. Apparatus according to claim 17, comprising two separate circumferentially offset friction members (50), each contacting a respective one of said rolling members (11). - a primary flywheel (3) for fixing to the crankshaft;
- a secondary flywheel (6) connected to said primary flywheel (3) by a plurality of elastic return members (9);
- a device (22) according to any one of claims 1 to 18, wherein said support of said device (22) is attached in particular to said secondary flywheel Mass flywheel (1).

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